Do I need to press AC before turning on the rearview mirror heating?

[StZachary]

You do not need to press AC before turning on the rearview mirror heating. Maintain a 30-centimeter distance: When approaching the car in front, try to keep a distance of about 30 centimeters. If it's too far, it may be difficult to park, and if it's too close, you might scratch someone else's car. Stop when the driver's position aligns with the side mirror of the adjacent car. If the adjacent vehicle is a large SUV, you can slightly adjust the position backward. Pay attention to the left rearview mirror: When the edge of your vehicle aligns with the right edge of the car behind, straighten the steering wheel. Then continue reversing straight back. During this process, you can make slight adjustments to the car's position.

[SanIsabella]

Speaking of the rearview mirror heating function, I've been driving for over a decade and often use it during rainy days or winter. Generally, you don't need to specifically press the AC button to activate the rearview mirror heating. The rearview mirror heating usually has a dedicated button, sometimes integrated with the defroster switch. Just press it, and the mirror will gradually warm up, melting fog or ice. The AC button is for the air conditioning system, mainly used for cooling or dehumidifying. Turning it on can make the interior drier, but it has no direct relation to heating the rearview mirrors. Of course, designs vary by car model—some premium vehicles might have linked controls, but in most cases, separate controls are more user-friendly. I also recommend developing a habit of checking the rearview mirror button position before setting off, in case of sudden weather changes that obscure visibility. Safety comes first—if you forget to turn it on and your vision gets blurry, accidents are more likely. Don’t worry about power consumption or fuel usage; rearview mirror heating doesn’t consume much energy, and short-term use won’t affect your car’s range. In short, just press the heating button directly—don’t overcomplicate a simple task.